Since Apple disconnected the App Store from iTunes, I can find no mechanism in either app to add data to ANY installed app, but specifically,, no way to add more PDFs to iGigbook. I keep writing songs that I need to keep in the system. I have iOS 11.0, and also 9.3.5 on an iPad, nether have access.

The remaining methods require I transfer my original tracks to the Cloud, which I really prefer to avoid. Apple has no need to know my music. I don't use iCloud except for Find My iPhone. Hell. i can't even insert a new song into my set lists anymore, have to add it at the bottom and drag it up into place or use pure alpha sort.) I am not a fan of the new system. As ALWAYS with Apple, I end up with less control of my own data, and less security.